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# metainfo.cpp Example File

network/torrent/metainfo.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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     ****************************************************************************/

     #include "bencodeparser.h"
     #include "metainfo.h"

     #include <QDateTime>
     #include <QMetaType>
     #include <QString>

     MetaInfo::MetaInfo()
     {
         clear();
     }

     void MetaInfo::clear()
     {
         errString = "Unknown error";
         content.clear();
         infoData.clear();
         metaInfoMultiFiles.clear();
         metaInfoAnnounce.clear();
         metaInfoAnnounceList.clear();
         metaInfoCreationDate = QDateTime();
         metaInfoComment.clear();
         metaInfoCreatedBy.clear();
         metaInfoName.clear();
         metaInfoPieceLength = 0;
         metaInfoSha1Sums.clear();
     }

     bool MetaInfo::parse(const QByteArray &data)
     {
         clear();
         content = data;

         BencodeParser parser;
         if (!parser.parse(content)) {
             errString = parser.errorString();
             return false;
         }

         infoData = parser.infoSection();

         QMap<QByteArray, QVariant> dict = parser.dictionary();
         if (!dict.contains("info"))
             return false;

         QMap<QByteArray, QVariant> info = qvariant_cast<Dictionary>(dict.value("info"));

         if (info.contains("files")) {
             metaInfoFileForm = MultiFileForm;

             QList<QVariant> files = info.value("files").toList();

             for (int i = 0; i < files.size(); ++i) {
                 QMap<QByteArray, QVariant> file = qvariant_cast<Dictionary>(files.at(i));
                 QList<QVariant> pathElements = file.value("path").toList();
                 QByteArray path;
                 foreach (QVariant p, pathElements) {
                     if (!path.isEmpty())
                         path += "/";
                     path += p.toByteArray();
                 }

                 MetaInfoMultiFile multiFile;
                 multiFile.length = file.value("length").toLongLong();
                 multiFile.path = QString::fromUtf8(path);
                 multiFile.md5sum = file.value("md5sum").toByteArray();
                 metaInfoMultiFiles << multiFile;
             }

             metaInfoName = QString::fromUtf8(info.value("name").toByteArray());
             metaInfoPieceLength = info.value("piece length").toInt();
             QByteArray pieces = info.value("pieces").toByteArray();
             for (int i = 0; i < pieces.size(); i += 20)
                 metaInfoSha1Sums << pieces.mid(i, 20);
         } else if (info.contains("length")) {
             metaInfoFileForm = SingleFileForm;
             metaInfoSingleFile.length = info.value("length").toLongLong();
             metaInfoSingleFile.md5sum = info.value("md5sum").toByteArray();
             metaInfoSingleFile.name = QString::fromUtf8(info.value("name").toByteArray());
             metaInfoSingleFile.pieceLength = info.value("piece length").toInt();

             QByteArray pieces = info.value("pieces").toByteArray();
             for (int i = 0; i < pieces.size(); i += 20)
                 metaInfoSingleFile.sha1Sums << pieces.mid(i, 20);
         }

         metaInfoAnnounce = QString::fromUtf8(dict.value("announce").toByteArray());

         if (dict.contains("announce-list")) {
             // ### unimplemented
         }

         if (dict.contains("creation date"))
             metaInfoCreationDate.setTime_t(dict.value("creation date").toInt());
         if (dict.contains("comment"))
             metaInfoComment = QString::fromUtf8(dict.value("comment").toByteArray());
         if (dict.contains("created by"))
             metaInfoCreatedBy = QString::fromUtf8(dict.value("created by").toByteArray());

         return true;
     }

     QByteArray MetaInfo::infoValue() const
     {
         return infoData;
     }

     QString MetaInfo::errorString() const
     {
         return errString;
     }

     MetaInfo::FileForm MetaInfo::fileForm() const
     {
         return metaInfoFileForm;
     }

     QString MetaInfo::announceUrl() const
     {
         return metaInfoAnnounce;
     }

     QStringList MetaInfo::announceList() const
     {
         return metaInfoAnnounceList;
     }

     QDateTime MetaInfo::creationDate() const
     {
         return metaInfoCreationDate;
     }

     QString MetaInfo::comment() const
     {
         return metaInfoComment;
     }

     QString MetaInfo::createdBy() const
     {
         return metaInfoCreatedBy;
     }

     MetaInfoSingleFile MetaInfo::singleFile() const
     {
         return metaInfoSingleFile;
     }

     QList<MetaInfoMultiFile> MetaInfo::multiFiles() const
     {
         return metaInfoMultiFiles;
     }

     QString MetaInfo::name() const
     {
         return metaInfoName;
     }

     int MetaInfo::pieceLength() const
     {
         return metaInfoPieceLength;
     }

     QList<QByteArray> MetaInfo::sha1Sums() const
     {
         return metaInfoSha1Sums;
     }

     qint64 MetaInfo::totalSize() const
     {
         if (fileForm() == SingleFileForm)
             return singleFile().length;

         qint64 size = 0;
         foreach (MetaInfoMultiFile file, multiFiles())
             size += file.length;
         return size;
     }